In an investigation that began last year, Inspector General Michael Horowitz is examining the Justice Department's and FBI's compliance with legal requirements as well as policies and procedures in applications filed with the U.S. Foreign Intelligence Surveillance Court related to Page as part of a larger counterintelligence probe into Trump's campaign.

The inspector general inquiry is expected to be completed in either late May or June, and diGenova, a former U.S. attorney for the District of Columbia, said Democrats on Capitol Hill are working overtime to investigate and discredit President Trump.

"They are doing that as a diversionary tactic away from the inevitable conclusions of the DOJ inspector general, Michael Horowitz, who, by the way, we have learned has concluded that the final three FISA extensions were illegally obtained," diGenova said on Fox Business. "The only question now is whether or not the first FISA was illegally obtained."

He pointed to memos, obtained by conservative group Citizens United through open-records litigation, that suggest the FBI might have misled the Foreign Intelligence Surveillance Court in the first warrant application about an unverified dossier.